Top Business Officer: Executive Vice PresidentâBusiness Operations for the Office of the President, Vice Chancellor for Administration, or the position responsible for the locationâs financial reporting and payroll as designated by the Executive Officer. III.
Answers. Best Answer: Primary nondisjunction can happen during meiosis when the chromosomes fail to separate as they should. This produces gametes with more than or less than the usual number of chromosomes. Secondary nondisjunction happens during meiosis in an individual whose chromosomes are already the wrong number because of nondisjunction. So, primary nondisjunction could produce a gamete with two Xs and a zygote with XXY. When this person matures and produces gametes, secondary nondisj.
Definition of Nondisjunction. Nondisjunction: Failure of paired chromosomes to separate (to disjoin) during cell division, so that both chromosomes go to one daughter cell and none go to the other. Nondisjunction causes errors in chromosome number, such as trisomy 21 (Down syndrome) and monosomy X (Turner syndrome). It is also a common cause of early spontaneous abortions.